1.\" Copyright (c) 1996-1999 Whistle Communications, Inc. 2.\" All rights reserved. 3.\" 4.\" Subject to the following obligations and disclaimer of warranty, use and 5.\" redistribution of this software, in source or object code forms, with or 6.\" without modifications are expressly permitted by Whistle Communications; 7.\" provided, however, that: 8.\" 1. Any and all reproductions of the source or object code must include the 9.\" copyright notice above and the following disclaimer of warranties; and 10.\" 2. No rights are granted, in any manner or form, to use Whistle 11.\" Communications, Inc. trademarks, including the mark "WHISTLE 12.\" COMMUNICATIONS" on advertising, endorsements, or otherwise except as 13.\" such appears in the above copyright notice or in the software. 14.\" 15.\" THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND 16.\" TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO 17.\" REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE, 18.\" INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF 19.\" MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. 20.\" WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY 21.\" REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS 22.\" SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE. 23.\" IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES 24.\" RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING 25.\" WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 26.\" PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR 27.\" SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY 28.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 29.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 30.\" THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY 31.\" OF SUCH DAMAGE. 32.\" 33.\" Author: Archie Cobbs <archie@FreeBSD.org> 34.\" 35.\" $FreeBSD: src/share/man/man4/ng_iface.4,v 1.13.2.1 2001/12/21 09:00:51 ru Exp $ 36.\" $DragonFly: src/share/man/man4/ng_iface.4,v 1.2 2003/06/17 04:36:59 dillon Exp $ 37.\" $Whistle: ng_iface.8,v 1.5 1999/01/25 23:46:26 archie Exp $ 38.\" 39.Dd January 19, 1999 40.Dt NG_IFACE 4 41.Os 42.Sh NAME 43.Nm ng_iface 44.Nd interface netgraph node type 45.Sh SYNOPSIS 46.In netgraph/ng_iface.h 47.Sh DESCRIPTION 48An 49.Nm iface 50node is both a netgraph node and a system networking interface. When an 51.Nm iface 52node is created, a new interface appears which is accessible via 53.Xr ifconfig 8 . 54.Nm Iface 55node interfaces are named 56.Dv ng0 , 57.Dv ng1 , 58etc. 59When a node is shutdown, the corresponding interface is removed 60and the interface name becomes available for reuse by future 61.Nm iface 62nodes; new nodes always take the first unused interface. 63The node itself is assigned the same name as its interface, unless the name 64already exists, in which case the node remains unnamed. 65.Pp 66An 67.Nm iface 68node has a single hook corresponding to each supported protocol. 69Packets transmitted via the interface flow out the corresponding 70protocol-specific hook. 71Similarly, packets received on a hook appear on the interface as 72packets received into the corresponding protocol stack. 73The currently supported protocols are IP, IPv6, AppleTalk, IPX, ATM, 74NATM, and NS. 75.Pp 76An 77.Nm iface 78node be configured as a point-to-point interface or a broadcast interface. 79The configuration can only be changed when the interface is down. 80The default mode is point-to-point. 81.Pp 82.Nm Iface 83nodes support the Berkeley Packet Filter (BPF). 84.Sh HOOKS 85This node type supports the following hooks: 86.Pp 87.Bl -tag -width foobar 88.It Dv inet 89Transmission and reception of IP packets. 90.It Dv inet6 91Transmission and reception of IPv6 packets. 92.It Dv atalk 93Transmission and reception of AppleTalk packets. 94.It Dv ipx 95Transmission and reception of IPX packets. 96.It Dv atm 97Transmission and reception of ATM packets. 98.It Dv natm 99Transmission and reception of NATM packets. 100.It Dv ns 101Transmission and reception of NS packets. 102.El 103.Sh CONTROL MESSAGES 104This node type supports the generic control messages, plus the following: 105.Bl -tag -width foo 106.It Dv NGM_IFACE_GET_IFNAME 107Returns the name of the interface corresponding to this node in a 108.Dv "struct ng_iface_ifname" : 109.Bd -literal -offset 4n 110struct ng_iface_ifname { 111 char ngif_name[NG_IFACE_IFACE_NAME_MAX + 1]; 112}; 113.Ed 114.It Dv NGM_IFACE_POINT2POINT 115Set the interface to point-to-point mode. 116The interface must not currently be up. 117.It Dv NGM_IFACE_BROADCAST 118Set the interface to broadcast mode. 119The interface must not currently be up. 120.It Dv NGM_CISCO_GET_IPADDR 121This message is defined by the 122.Xr ng_cisco 4 123node type; see 124.Xr ng_cisco 4 125for a description. 126.El 127.Sh SHUTDOWN 128This node shuts down upon receipt of a 129.Dv NGM_SHUTDOWN 130control message. The associated interface is removed and becomes available 131for use by future 132.Nm iface 133nodes. 134.Pp 135Unlike most other node types, an 136.Nm iface 137node does 138.Em not 139go away when all hooks have been disconnected; rather, and explicit 140.Dv NGM_SHUTDOWN 141control message is required. 142.Sh SEE ALSO 143.Xr bpf 4 , 144.Xr netgraph 4 , 145.Xr ng_cisco 4 , 146.Xr ifconfig 8 , 147.Xr ngctl 8 148.Sh HISTORY 149The 150.Nm iface 151node type was implemented in 152.Fx 4.0 . 153.Sh AUTHORS 154.An Archie Cobbs Aq archie@FreeBSD.org 155